My Days – Tracking Fertility and Ovulation

Christian Albert Mueller

With over 3 million downloads on iOS and Android, My Days is the #1 period and ovulation tracking app on the market. Developer Christian Albert Mueller relied on Corona SDK for cross-platform support, easy to use APIs and the simplicity of the Lua language.

What’s your development background?

I have been an autodidact programmer since 1982, starting with C64, Basic, Modula, Pascal, and Delphi. Starting in 1996, I began working on web pages and then in 2008 I started creating mobile apps for Android and iOS.

Why did you turn to Corona SDK to develop your latest app, My Days?

When I began working on My Days in 2011, I wanted to publish simultaneously for iOS and Android.

I really took to the Lua language as it allows me to see results in a short amount of time. Also, I love the speed of the Corona Simulator – it’s gratifying to see instant results right after I make a change in the code. I needed simple, fast database for the app and Corona SDK helped me create this thanks to easy APIs and great support in the forum.

Please share the functionality of My Days.

My Days is a simple period and ovulation tracker for women that predicts upcoming high fertile days, ovulation and periods. The app also allows women to take notes in the app to track days when they are intimate, when/if they take a birth control pill, their mood during menstruation and other notable information. For pregnant women, My Days also offers a pregnancy mode that shows a baby’s due date.

I focused on creating an app that is simple to use and based on feedback, users enjoy the easy UI and comprehensive app features. I just recently implemented ads, but previous to this, the app was free.

Which Corona libraries were particularly useful for your development?

I mainly relied on the TableViewNew, Director, Socket and UI libraries.

How long did it take to get My Days to market?

The basic app was done just in a few weeks, but then testing began. This process took about three months, as I was very focused on creating the best possible user experience, sans any bugs. Right after I sorted out all the kinks, I published the app and it took off.

My Days soared to the #1 spot in the lifestyle category on iTunes. Can you share any other recognitions the app has received?

With over 3,000,000 downloads, My Days has become one of the most recognized period and ovulation trackers on the market. It’s regularly featured worldwide in the App Store’s “What’s Hot” section and has an average rating of 4.8 out of 5 stars based on thousands of reviews.

Congratulations on your success! Based on your experience, do you recommend Corona SDK for utility app development?

Yes, I recommend Corona to other developers regularly. Developing with Corona is much faster than with Xcode or Java and I love that I can code once and publish to multiple markets.

Corona SDK Apps by Christian Albert Mueller

My Days

My Days Period & Ovulation Calendar is the simplest way to track your last period and help assess when you could expect to be ovulating. If you are trying to get pregnant, My Days predicts your most fertile days and lets you track your basal metabolic temperature (BMT).